EXFO FVA-60B, Руководство пользователя

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Operating the FVA-60B Variable Optical Attenuator 6
Using the Relative Mode
The Relative mode allows the user to establish a 0.00 dB reference attenuation at
any value within the unit’s attenuation range.
To establish a reference:
1.
Ensure the unit is in Absolute mode. See Using the Absolute Mode on page 5.
2.
Select the appropriate wavelength by pressing shift/exit , then λ SELECT . To
program wavelengths, see Programming Wavelengths on page 7.
3.
Set the desired attenuation level by using or . For details about
how to set attenuation, see Setting Attenuation Step Sizes on page 7.
4.
Press atten./rel. The smaller digits display the total attenuation, while the larger
digits display the attenuation with respect to the selected reference
(i.e., 00.00 dB).
5.
If you now change the attenuation, the smaller digits display the total
attenuation introduced by the FVA-60B, while the larger digits display the
relative loss (or gain) with respect to the selected reference.
Using the X + B Mode
The X + B mode displays the sum of X + B values, where X is the actual attenuation
introduced by the unit, and B is some offset value, possibly a power level or a
known system loss. The X + B mode allows the user to display attenuation readings
as any value between
−
99.95 dB and 99.95 dB.
To use the X + B mode:
1.
Ensure the unit is in Absolute mode. See Using the Absolute Mode on page 5.
2.
Select the appropriate wavelength by pressing shift/exit , then λ SELECT . To
program wavelengths, see Programming Wavelengths on page 7.
3.
Set the initial attenuation value X by using or . For details about
how to set attenuation, see Setting Attenuation Step Sizes on page 7.
4.
Press shift/exit , then X + B . The larger digits flash and the smaller digits display
the initial attenuation.
5.
Set the desired X + B value by using or . The value displayed on
the smaller digits (absolute attenuation) does not change, since setting the
arbitrary X + B value has no influence on the actual attenuation.
6.
Press shift/exit when the X + B value is set.
If you now vary the attenuation value X, both the absolute attenuation value and the
X + B value increase or decrease accordingly.
Operating the FVA-60B Variable Optical Attenuator 6
Using the Relative Mode
The Relative mode allows the user to establish a 0.00 dB reference attenuation at
any value within the unit’s attenuation range.
To establish a reference:
1.
Ensure the unit is in Absolute mode. See Using the Absolute Mode on page 5.
2.
Select the appropriate wavelength by pressing shift/exit , then λ SELECT . To
program wavelengths, see Programming Wavelengths on page 7.
3.
Set the desired attenuation level by using or . For details about
how to set attenuation, see Setting Attenuation Step Sizes on page 7.
4.
Press atten./rel. The smaller digits display the total attenuation, while the larger
digits display the attenuation with respect to the selected reference
(i.e., 00.00 dB).
5.
If you now change the attenuation, the smaller digits display the total
attenuation introduced by the FVA-60B, while the larger digits display the
relative loss (or gain) with respect to the selected reference.
Using the X + B Mode
The X + B mode displays the sum of X + B values, where X is the actual attenuation
introduced by the unit, and B is some offset value, possibly a power level or a
known system loss. The X + B mode allows the user to display attenuation readings
as any value between
−
99.95 dB and 99.95 dB.
To use the X + B mode:
1.
Ensure the unit is in Absolute mode. See Using the Absolute Mode on page 5.
2.
Select the appropriate wavelength by pressing shift/exit , then λ SELECT . To
program wavelengths, see Programming Wavelengths on page 7.
3.
Set the initial attenuation value X by using or . For details about
how to set attenuation, see Setting Attenuation Step Sizes on page 7.
4.
Press shift/exit , then X + B . The larger digits flash and the smaller digits display
the initial attenuation.
5.
Set the desired X + B value by using or . The value displayed on
the smaller digits (absolute attenuation) does not change, since setting the
arbitrary X + B value has no influence on the actual attenuation.
6.
Press shift/exit when the X + B value is set.
If you now vary the attenuation value X, both the absolute attenuation value and the
X + B value increase or decrease accordingly.
Operating the FVA-60B Variable Optical Attenuator 6
Using the Relative Mode
The Relative mode allows the user to establish a 0.00 dB reference attenuation at
any value within the unit’s attenuation range.
To establish a reference:
1.
Ensure the unit is in Absolute mode. See Using the Absolute Mode on page 5.
2.
Select the appropriate wavelength by pressing shift/exit , then λ SELECT . To
program wavelengths, see Programming Wavelengths on page 7.
3.
Set the desired attenuation level by using or . For details about
how to set attenuation, see Setting Attenuation Step Sizes on page 7.
4.
Press atten./rel. The smaller digits display the total attenuation, while the larger
digits display the attenuation with respect to the selected reference
(i.e., 00.00 dB).
5.
If you now change the attenuation, the smaller digits display the total
attenuation introduced by the FVA-60B, while the larger digits display the
relative loss (or gain) with respect to the selected reference.
Using the X + B Mode
The X + B mode displays the sum of X + B values, where X is the actual attenuation
introduced by the unit, and B is some offset value, possibly a power level or a
known system loss. The X + B mode allows the user to display attenuation readings
as any value between
−
99.95 dB and 99.95 dB.
To use the X + B mode:
1.
Ensure the unit is in Absolute mode. See Using the Absolute Mode on page 5.
2.
Select the appropriate wavelength by pressing shift/exit , then λ SELECT . To
program wavelengths, see Programming Wavelengths on page 7.
3.
Set the initial attenuation value X by using or . For details about
how to set attenuation, see Setting Attenuation Step Sizes on page 7.
4.
Press shift/exit , then X + B . The larger digits flash and the smaller digits display
the initial attenuation.
5.
Set the desired X + B value by using or . The value displayed on
the smaller digits (absolute attenuation) does not change, since setting the
arbitrary X + B value has no influence on the actual attenuation.
6.
Press shift/exit when the X + B value is set.
If you now vary the attenuation value X, both the absolute attenuation value and the
X + B value increase or decrease accordingly.
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